Zausch, J. and Horbach, J. and Laurati, M. and Egelhaaf, S. U. and Brader, J. M. and Voigtmann, T. and Fuchs, M. (2008) From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear. Journal of Physics - Condensed Matter, 20, 404210/1-404210/13. DOI: 10.1088/0953-8984/20/40/404210.
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We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulation, mode coupling theory and confocal microscopy experiment is used to investigate the origins of the widely observed stress overshoot and (previously not reported) super-diffusive motion in the transient dynamics. A link between the macro-rheological stress versus strain curves and the microscopic particle motion is established. Negative correlations in the transient auto-correlation function of the potential stresses are found responsible for both phenomena, and arise even for homogeneous flows and almost Gaussian particle displacements.
|Title:||From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear|
|Journal or Publication Title:||Journal of Physics - Condensed Matter|
|In ISI Web of Science:||Yes|
|Keywords:||molecular dynamics, glass forming liquids under shear, confocal microscopy, mode coupling serie|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen (old)|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Ingeborg Parpart|
|Deposited On:||21 Oct 2008|
|Last Modified:||27 Apr 2009 15:08|
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